I am working on WiFiManager Code using Library Wifi Manager library by tzapu. I wish to work OnDemand and Custom Parameters. After formatting the SPIFFS, the custom parameters get saved in memory during the first configuration. I press the button (FLASH) for OnDemand configuration this time I give different values in the custom Parameters field. It connects and shows these new values of parameters in the serial monitor. But after reset when it automatically connects, the values are shown were of previous and not which are supplied while OnDemand. That means the values supplied during the OnDemand Configuration are not being saved in the memory of NodeMCU. Kindly help me or point me where I am going wrong.
#include <FS.h> //this needs to be first, or it all crashes and burns...
#include <WiFiManager.h> //https://github.com/tzapu/WiFiManager
// select which pin will trigger the configuration portal when set to LOW
#define TRIGGER_PIN 0
int timeout = 120; // seconds to run for
#ifdef ESP32
#include <SPIFFS.h>
#endif
#include <ArduinoJson.h> //https://github.com/bblanchon/ArduinoJson
//define your default values here, if there are different values in config.json, they are overwritten.
char mqtt_server[40];
char mqtt_port[6] = "8080";
char api_token[34] = "YOUR_API_TOKEN";
//flag for saving data
bool shouldSaveConfig = false;
//callback notifying us of the need to save config
void saveConfigCallback () {
Serial.println("Should save config");
shouldSaveConfig = true;
}
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.println();
pinMode(TRIGGER_PIN, INPUT_PULLUP);
//clean FS, for testing
//SPIFFS.format();
//read configuration from FS json
Serial.println("mounting FS...");
if (SPIFFS.begin()) {
Serial.println("mounted file system");
if (SPIFFS.exists("/config.json")) {
//file exists, reading and loading
Serial.println("reading config file");
File configFile = SPIFFS.open("/config.json", "r");
if (configFile) {
Serial.println("opened config file");
size_t size = configFile.size();
// Allocate a buffer to store contents of the file.
std::unique_ptr<char[]> buf(new char[size]);
configFile.readBytes(buf.get(), size);
#ifdef ARDUINOJSON_VERSION_MAJOR >= 6
DynamicJsonDocument json(1024);
auto deserializeError = deserializeJson(json, buf.get());
serializeJson(json, Serial);
if ( ! deserializeError ) {
#else
DynamicJsonBuffer jsonBuffer;
JsonObject& json = jsonBuffer.parseObject(buf.get());
json.printTo(Serial);
if (json.success()) {
#endif
Serial.println("\nparsed json");
strcpy(mqtt_server, json["mqtt_server"]);
strcpy(mqtt_port, json["mqtt_port"]);
strcpy(api_token, json["api_token"]);
} else {
Serial.println("failed to load json config");
}
configFile.close();
}
}
} else {
Serial.println("failed to mount FS");
}
//end read
// The extra parameters to be configured (can be either global or just in the setup)
// After connecting, parameter.getValue() will get you the configured value
// id/name placeholder/prompt default length
WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 6);
WiFiManagerParameter custom_api_token("apikey", "API token", api_token, 32);
//WiFiManager
//Local intialization. Once its business is done, there is no need to keep it around
WiFiManager wifiManager;
//set config save notify callback
wifiManager.setSaveConfigCallback(saveConfigCallback);
//set static ip
//wifiManager.setSTAStaticIPConfig(IPAddress(10, 0, 1, 99), IPAddress(10, 0, 1, 1), IPAddress(255, 255, 255, 0));
//add all your parameters here
wifiManager.addParameter(&custom_mqtt_server);
wifiManager.addParameter(&custom_mqtt_port);
wifiManager.addParameter(&custom_api_token);
//reset settings - for testing
//wifiManager.resetSettings();
//set minimu quality of signal so it ignores AP's under that quality
//defaults to 8%
//wifiManager.setMinimumSignalQuality();
//sets timeout until configuration portal gets turned off
//useful to make it all retry or go to sleep
//in seconds
//wifiManager.setTimeout(120);
//fetches ssid and pass and tries to connect
//if it does not connect it starts an access point with the specified name
//here "AutoConnectAP"
//and goes into a blocking loop awaiting configuration
if (!wifiManager.autoConnect("AutoConnectAP", "password")) {
Serial.println("failed to connect and hit timeout");
delay(3000);
//reset and try again, or maybe put it to deep sleep
ESP.restart();
delay(5000);
}
//if you get here you have connected to the WiFi
Serial.println("connected...yeey :)");
//read updated parameters
strcpy(mqtt_server, custom_mqtt_server.getValue());
strcpy(mqtt_port, custom_mqtt_port.getValue());
strcpy(api_token, custom_api_token.getValue());
Serial.println("The values in the file are: ");
Serial.println("\tmqtt_server : " + String(mqtt_server));
Serial.println("\tmqtt_port : " + String(mqtt_port));
Serial.println("\tapi_token : " + String(api_token));
//save the custom parameters to FS
if (shouldSaveConfig) {
Serial.println("saving config");
#ifdef ARDUINOJSON_VERSION_MAJOR >= 6
DynamicJsonDocument json(1024);
#else
DynamicJsonBuffer jsonBuffer;
JsonObject& json = jsonBuffer.createObject();
#endif
json["mqtt_server"] = mqtt_server;
json["mqtt_port"] = mqtt_port;
json["api_token"] = api_token;
File configFile = SPIFFS.open("/config.json", "w");
if (!configFile) {
Serial.println("failed to open config file for writing");
}
#ifdef ARDUINOJSON_VERSION_MAJOR >= 6
serializeJson(json, Serial);
serializeJson(json, configFile);
#else
json.printTo(Serial);
json.printTo(configFile);
#endif
configFile.close();
//end save
}
Serial.println("local ip");
Serial.println(WiFi.localIP());
}
void loop() {
// is configuration portal requested?
if ( digitalRead(TRIGGER_PIN) == LOW) {
WiFiManager wm;
WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 6);
WiFiManagerParameter custom_api_token("apikey", "API token", api_token, 32);
wm.addParameter(&custom_mqtt_server);
wm.addParameter(&custom_mqtt_port);
wm.addParameter(&custom_api_token);
//reset settings - for testing
//wm.resetSettings();
// set configportal timeout
wm.setConfigPortalTimeout(timeout);
if (!wm.startConfigPortal("OnDemandAP")) {
Serial.println("failed to connect and hit timeout");
delay(3000);
//reset and try again, or maybe put it to deep sleep
ESP.restart();
delay(5000);
}
//if you get here you have connected to the WiFi
Serial.println("connected...yeey :)");
}
// put your main code here, to run repeatedly:
